US5946870A

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Info

Publication number: US5946870A
Application number: US09/059,743
Authority: US
Inventors: Gabriel F. Bifano; Erenio Reyes
Original assignee: Vinyl Corp
Current assignee: Clarkwestern Dietrich Building Systems LLC
Priority date: 1998-04-14
Filing date: 1998-04-14
Publication date: 1999-09-07
Anticipated expiration: 2018-04-14
Also published as: US6119429A; CA2259875A1

Abstract

A panel support construction accessory includes a back flange and a bottom flange obliquely extending from the back flange. The bottom flange includes an array of perforations for permitting moisture removal. Preferably, the panel support construction accessory additionally includes a lower flange coupled to the bottom flange and spaced from the bottom flange to create a cavity below the array of perforations. A filter material, such as open cellular material, is supported adjacent the array of perforations. The filter material transmits moisture. Alternatively, the construction accessory includes a forward flange extending between the lower flange and the bottom flange in lieu of or in addition to the filter material. Preferably, at least one of the lower flange and the forward flange includes an opening that communicates with the cavity.

Description

RELATED CO-PENDING APPLICATION

The present application is related to co-pending U.S. patent application Ser. No. 09/059,806 by Gabriel F. Bifano and Erenio Reyes entitled "CONSTRUCTION ACCESSORY" filed on the same date herewith.

FIELD OF THE INVENTION

The present invention relates to construction accessories. In particular, the present invention relates to a panel support construction accessory utilized in a wall structure, wherein a panel support construction accessory partially encloses a construction panel and removes moisture from about the construction panel.

BACKGROUND OF THE INVENTION

Panel support construction accessories come in a variety of different configurations, shapes and sizes, and serve a variety of different functions in exterior construction applications. Panel support construction accessories generally include a plurality of flanges obliquely extending relative to one another to form a channel sized to receive a construction panel. Panel support construction accessories have various uses, such as supporting panels, supporting coatings of construction fluid materials adjacent the panels, producing durable straight lines, smooth curves and arches, providing soffit ventilation, controlling expansion and contraction and protecting corners and edges. Panel support construction assemblies further protect and preserve edges of construction panels, such as wallboard, sheathing, and insulation boards from impact and condensation. Panel support construction accessories are commonly known by various names, including but not limited to, corner beads, casing beads, starter strip/casing beads, reinforced, drip casing beads, controlled joints and soffit vents. Panel support construction accessories are used in exterior finishing systems known as direct exterior finishing systems (DEFS) and exterior insulated finishing systems (EIFS).

Panel support construction accessories are typically supported adjacent a support structure lined with a moisture barrier. After a construction panel is inserted into the channel of the panel support construction accessory, the front of the accessory as well as the front of the construction panel are typically coated with a polymer based or polymer modified exterior construction fluid material, such as stucco, cement matrix material or gypsum matrix materials, including acrylic modifiers, or are lined with a preformed sheet of weatherproof material. As a result, the panel support construction accessory, moisture barrier and the outer coating, or sheet of weatherproof material, form an enclosure partially surrounding and encasing the construction panel. In addition to encasing the construction panel, the enclosure traps moisture adjacent to the construction panel. Unless perfectly sealed, additional moisture may enter the system through various cracks or openings. Moisture trapped within the enclosure and condenses to damage the construction panel. In addition, trapped moisture may change state from a liquid to a solid (ice) and expand in volume. This change in volume further damages the enclosure by causing the coating to crack or by causing deformation of the panel support construction accessory. As a result, it is critical that moisture within the enclosure be allowed to escape. At the same time, however, it is also critical that any methods used to vent moisture from the enclosure not enable wind-blown moisture to re-enter the enclosure or allow insects, such as flying termites, to enter the enclosure.

SUMMARY OF THE INVENTION

The present invention is directed to a panel support construction accessory including a back flange and a bottom flange extending from the back flange. The bottom flange includes an array of perforations extending through the bottom flange. The array of perforations have a maximum diameter of about one-eighth of an inch.

According to one aspect of the present invention, the panel support construction accessory includes a lower flange coupled to the bottom flange and spaced from the bottom flange to form a cavity below the array of perforations. In one embodiment, a spacer is coupled between the bottom flange and the lower flange. Preferably, the spacer is welded to the bottom flange and the lower flange. Preferably, the lower flange provides a surface adjacent the cavity which downwardly slopes away from the back flange and away from the bottom flange. In one embodiment, the panel support construction accessory additionally includes a leg coupled to the lower flange and extending beyond the bottom flange.

According to yet another aspect of the present invention, the panel support construction accessory includes a filter material supported adjacent the array of perforations. The filter material is configured to transmit moisture. The filter material preferably comprises an open cellular material or screening. In one embodiment, the panel support construction accessory includes a lower flange coupled to the bottom flange and spaced from the bottom flange below the array of perforations. The filter material is supported adjacent the array of perforations between the bottom flange and the lower flange.

According to yet another aspect of the present invention, the panel support construction accessory includes a lower flange coupled to the bottom flange, wherein the lower flange is spaced from the bottom flange to form a cavity below the array of perforations. The panel support construction accessory further includes a forward flange extending between the lower flange and the bottom flange adjacent the cavity. At least one of the bottom flange and the lower flange includes an opening communicating with the cavity. Preferably, the opening extends through the forward flange and communicates with the cavity.

According to yet additional aspects of the present invention, the panel support construction accessory may additionally include a front flange extending from the bottom flange. The front flange preferably includes perforations extending through the front flange and depressions extending into a surface of the front flange and communicating with at least one of the perforations. The construction accessary may additionally include a side flange extending from the bottom flange and a support flange extending from the side flange. The side flange and the support flange form a channel. Preferably, the support flange forms a ridge sized to elevate a construction panel above the bottom flange.

The present invention is also directed to a panel support construction accessory including a back flange; a bottom flange and a lower flange. The bottom flange extends from the back flange and includes a plurality of perforations extending therethrough. The lower flange is coupled to the bottom flange and is spaced from the bottom flange below the plurality of perforations.

The present invention is also directed to a construction accessory component for use with a panel support having a back flange, a bottom flange and at least one perforation extending through the bottom flange. The component includes a lower flange configured for mounting to the panel support so as to provide a surface spaced from the bottom flange below said at least one perforation when mounted to the panel support. The construction accessory component preferably includes a spacer extending from the lower flange and configured to mount the lower flange to the bottom flange. The construction accessory component also preferably includes a forward flange extending from the lower flange. An opening preferably extends through at least one of the lower flange and the forward flange to communicate with space above the surface. In the exemplary embodiment illustrated, the opening extends through the forward flange.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an exemplary panel support construction accessory of the present invention.

FIG. 2 is a sectional view of a structure incorporating the panel support construction accessory of FIG. 1.

FIG. 3 is a perspective view of a second embodiment of the panel support construction accessory of FIGS. 1 and 2.

FIG. 4 is a sectional view of a structure incorporating the panel support construction accessory of FIG. 3.

FIG. 5 is a perspective view of a third embodiment of the panel support construction accessory of FIGS. 1 and 2.

FIG. 6 is an exploded perspective view of the panel support construction accessory of FIG. 5.

FIG. 7 is a sectional view of a structure incorporating the panel support construction accessory of FIG. 5.

FIG. 8 is a sectional view of a structure incorporating a fourth embodiment of the panel support construction accessory of FIGS. 1 and 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIGS. 1 and 2 illustrate panelsupport construction accessory 10. FIG. 1 is a perspective view of panelsupport construction accessory 10. FIG. 2 is a sectional view of panelsupport construction accessory 10 utilized in astructure 12. As best shown by FIG. 1,construction accessory 10 generally includes backflange 14,bottom flange 16,side flange 18,support flange 20 andfront flange 22. Back flange 14,bottom flange 16,side flange 18,support flange 20, andfront flange 22 nonparallel extend relative to one another to form anaxially extending channel 24 sized to receive and support a construction panel adjacent structural members. Back flange 14 is a generally elongate panel configured for being mounted adjacent to a structural support member of a structure.

Bottom flange 16 comprises an elongate, panel coupled to backflange 14 and extending from backflange 14.Bottom flange 16 preferably obliquely extends nonparallel from backflange 14 at an angle of about ninety degrees.Bottom flange 16 has afirst edge 28 coupled to backflange 14 and a secondopposite edge 30 coupled toside flange 18.Bottom flange 16 includes anarray 32 ofperforations 34 extending throughbottom flange 16.Perforations 34 generally comprise apertures or openings extending throughbottom flange 16 and sized for transmitting moisture from withinchannel 24.Perforations 34 are configured into anelongate array 32 axially extending along the length ofaccessory 10adjacent back flange 14.Array 32 preferably comprises three rows ofperforations 34 such thatmultiple perforations 34 colinearly extend between

edges

28 and 30 ofbottom flange 16. It has been discovered thatarray 32 ofperforations 34 effectively eliminates moisture from withinchannel 24. Becausearray 32 extends alongedge 28 ofbottom flange 16adjacent back flange 14, rain and other wind-blown moisture is less likely to be blown throughperforations 34 intochannel 24. Becauseperforations 34 have a maximum diameter of approximately one-eighth of an inch,perforations 34 further prevent wind-blown moisture from entering throughperforations 34 and further prevent winged insects, such as winged termites, from enteringchannel 24 throughperforations 34. Moreover, becauseperforations 34 are arranged in anarray 32 having a plurality of perforation rows axially extending alongbottom flange 16 and havingmultiple perforations 34 colinearly extending betweenedge 28 and edge 30 ofbottom flange 16,perforations 34 more effectively transmit moisture out ofchannel 24. In addition, becausebottom flange 16 includes anarray 32 ofperforations 34, accidental blockage of everyperforation 34, such as by painting, is generally eliminated.

Side flange 18,support flange 20 andfront flange 22 are described and illustrated in co-pending patent application U.S. patent application Ser. No. 09/059,806, by Gabriel F. Bifano and Erenio Reyes entitled "CONSTRUCTION ACCESSORY" filed on the same date herewith (hereby incorporated by reference). As shown by FIG. 1,side flange 18 andsupport flange 20 form achannel 38 sized to receive a reinforcement member such as a splice (not shown) for connectingadjacent accessories 10.Support flange 20further forms shoulder 40 andridge 42, the functions of which are illustrated in FIG. 2.Front flange 22 obliquely extends fromsupport flange 20 betweenshoulder 40 andridge 42.Front flange 22 includesperforations 46 which extend between aninner surface 48 and anouter surface 50 offront flange 22.Front flange 22 further includes

depressions

52, 54.

Depressions

52, 54 comprise elongate channels formed withinouter surface 50 andinner surface 48, respectively, offront flange 22.

Depressions

52, 54 extend along the axial length offront flange 22 and communicate betweenperforations 46 to increase the flow of construction fluid materials alongfront flange 22.

FIG. 2 illustrates panelsupport construction accessory 10 incorporated intostructure 12. As shown by FIG. 2,structure 12 additionally includesfoundation 58,

structural support members

60, 62,moisture barrier 64,construction panel 66, coating 68 andfastener 70.Foundation 58 and

structural support member

60 and 62 form a conventionally known structural arrangement whereinstructural support member 60 comprises a base two-by-four andstructural support member 62 comprises a stud two-by-four fastened tomember 62. As shown by FIG. 2,accessory 10 is fastened tostructural support member 60 byfastener 70. To prevent moisture from entering a building or other enclosure formed bystructure 12,moisture barrier 64 is positioned withinchannel 24 overback flange 14 and adjacent

structural support members

60 and 62. As can be appreciated, backflange 14 ofaccessory 10 may be affixed to either

structure support member

60 or 62 by various other adhesives or fasteners. Moreover, backflange 14 may alternatively be affixed on intermediate sheet or panel affixed to

structural support members

60 and 62.

Construction panel 66 extends withinchannel 24 ofaccessory 10. As shown by FIG. 4,ridge 42 elevatesconstruction panel 66 abovebottom flange 16 to form a gap orspace 74 betweenbottom flange 16 andconstruction panel 66.Space 74 allows moisture accumulation and facilitates the discharge of moisture from betweenmoisture barrier 64 andcoating 68 throughperforations 34 as indicated byarrows 78.

Shoulder 40 supports coating 68 adjacentfront flange 22 andadjacent construction panel 66. As a result, coating 68 forms afrontal surface 82 which is contiguous with a front surface ofside flange 18. Consequently,side flange 18 andbottom flange 16 also provide a smooth and impact resistant corner to the front face ofstructure 12. This corner as well as the front surfaces ofside flange 18 andcoating 68 may be painted, further finished or left in a natural state.

Construction accessory 10 is preferably extruded from a vinyl compound.Construction accessory 10 is preferably extruded from a weatherable exterior grade polyvinylchloride.Construction accessory 10 alternatively may be formed from various other polymer or vinyl compounds, aluminum, galvanized steel or other metals. Moreover, in lieu of being integrally formed as part of a single unitary body,construction accessory 10 may be formed using various distinct prefabricated components, which are glued, welded or otherwise affixed to one another to formconstruction accessory 10. Back flange 14,bottom flange 16,side flange 18,support flange 20 andfront flange 22 preferably have a thickness of about 1/16th of an inch. As can be appreciated, the thickness of each of

flanges

14, 16, 18, 20 and 22 will independently vary depending upon construction application.Perforations 46 preferably have a diameter of about 0.25 inches and are drilled or punched intofront flange 22.

Depressions

52 and 54 are preferably extruded withfront flange 22. Alternatively,perforations 46 as well as

depressions

52 and 54 may be formed by various other manufacturing techniques.

FIGS. 3 and 4 illustrate panel support construction accessory 110, a second embodiment of panelsupport construction accessory 10 shown in FIGS. 1 and 2. As shown in FIG. 3, panel support construction accessory 110 includesarray 132 ofperforations 34 in lieu ofarray 32 ofperforations 34. Accessory 110 additionally includeslower flange 180,spacer 182,drip leg 184 andfilter material 186. For ease of illustration, those elements of accessory 110 which substantially correspond to similar elements ofaccessory 10 are numbered similarly.Array 132 is similar toarray 32 except thatarray 132 extends proximate to edge 30 ofbottom flange 16 axially along accessory 110. In particular,array 132 ofperforations 34 is transversely located betweenridge 42 andspacer 182. As witharray 32,array 132 ofperforations 34 comprises three rows ofperforations 34 such thatmultiple perforations 34 colinearly extend between

edges

28 and 30 ofbottom flange 16. It has been discovered thatarray 32 ofperforations 34 effectively eliminates moisture from withinchannel 24. Becauseperforations 34 have a maximum diameter of approximately one-eighth of an inch,perforations 34 further prevent wind-blown moisture from entering throughperforations 34 and further prevent winged insects, such as winged termites, from enteringchannel 24 throughperforations 34. Moreover, becauseperforations 34 are arranged in anarray 32 having a plurality of perforation rows axially extending alongbottom flange 16 havingmultiple perforations 34 colinearly extending betweenedge 28 and edge 30 ofbottom flange 16,perforations 34 more effectively transmit moisture out ofchannel 24.

Lower flange 180 is a generally elongate imperforate panel coupled tobottom flange 16 and spaced frombottom flange 16 to form acavity 188 adjacent to and belowarray 132 ofperforations 34. In the preferred embodiment illustrated,lower flange 180 is spaced frombottom flange 16 by approximately 1/32 to 1/4 of an inch. In the embodiment illustrated,lower flange 180 is spaced from bottom flange by 1/16 of an inch.Lower flange 180 prevents wind-blown moisture from enteringchannel 24 throughperforations 34.Lower flange 180 also impedes flying insects from enteringchannel 24 throughapertures 34. At the same time,lower flange 180 directs moisture expelled fromchannel 24 throughperforations 34 outward towardsleg 184.Lower flange 180 is preferably coupled tobottom flange 16 byspacer 182. Alternatively,lower flange 180 may be integrally formed withbottom flange 16 or backflange 14.

Spacer 182 comprises an elongate strip and is positioned betweenbottom flange 16 andlower flange 180.Spacer 182 preferably has a thickness of about 40-70 thousands of an inch so as to spacebottom flange 16 fromlower flange 180 by at least a corresponding distance.Spacer 182 preferably has a width transversely extending fromedge 28 towardsedge 30 ofbottom flange 16 such thatspacer 182 terminates adjacent to perforations 34.Spacer 182 extends along the axial length of accessory 110adjacent edge 28 ofbottom flange 16.Spacer 182 preferably comprises an independent component fastened, preferably by welding, to bothbottom flange 16 andlower flange 180. Alternatively,spacer 182 may be integrally formed as part of a single unitary body with eitherbottom flange 16 orlower flange 180. It has been discovered that becausespacer 182 comprises a component distinct either frombottom flange 16 orlower flange 180,spacer 182 increases the rigidity and stiffness ofbottom flange 16. Although less desirable,spacer 182 may alternatively be integrally formed with bothflange 16 andlower flange 180.

Drip leg 184 comprises an elongate imperforate strip coupled tobottom flange 16 proximate to edge 30 ofbottom flange 16. In the embodiment illustrated,drip leg 184 is coupledbottom flange 16 vialower flange 180 andspacer 182. Alternatively,drip leg 184 may be directly attached to or extruded withbottom flange 16.Drip leg 184 extends away from and beyondedge 30 ofbottom flange 16 to direct moisture such as rain or snow away from an underlying structure such as a door or window casing. Becausedrip leg 184 preferably extends fromlower flange 180 belowperforations 34,leg 184 additionally directs moisture escaping fromspace 74 away from the underlying structure.Drip leg 184 obliquely extends fromlower flange 180 at a downward angle.

Filter material 186 extends adjacent and overarray 132 ofperforations 34.Filter material 186 is preferably located withincavity 188 betweenbottom flange 16 andlower flange 180.Filter material 186 permits the flow of moisture throughfilter material 186. At the same time,filter material 186 prevents larger aggregations of wind-blown moisture as well as flying insects from passing throughfilter 186 and throughperforations 34. Althoughfilter material 186 may comprise any one of a variety of known materials having such characteristics,filter material 186 preferably comprises an open celled vinyl coated mesh or screening. Becausefilter material 186 preferably comprises an open celled material or screening,filter material 186 further strengthens and rigidifies panel support construction accessory 110.

Construction accessory 110 is preferably extruded from a virgin vinyl compound. Accessory 110 is preferably extruded from a weatherable grade, lead-free polyvinylchloride. Construction accessory 110 alternatively may be formed from various other polymer or vinyl compounds, aluminum, galvanized steel or other metals. Moreover, in lieu ofback flange 14,bottom flange 16,side flange 18,support flange 20 andfront flange 22 being integrally formed as part of a single unitary body, components may alternately be formed using various distinct prefabricated components which are glued, welded or otherwise affixed to one another to form construction accessory 110.

As shown by FIG. 4, moisture accumulates withinspace 74 belowconstruction panel 66 and abovebottom flange 16. As shown byarrows 178, moisture accumulated withinspace 74 flows throughperforations 34 and throughfilter material 186 betweenbottom flange 16 andlower flange 180. The moisture further flows acrosslower flange 180 and is directed away from window ordoor casing 190 bydrip leg 184. As a result, construction accessory 110 facilitates the removal of undesirable moisture otherwise captured betweenmoisture barrier 64 andcoating 68 to prolong the life ofstructure 12.

As best shown by FIG. 7, moisture accumulated withinspace 74 flows throughperforations 34 intocavity 188 as indicated by arrow 293. Moisture withincavity 188 further flows acrosslower flange 180 throughopenings 292 where the moisture is directed away from window ordoor casing 190 bydrip leg 184 as indicated byarrow 294. As a result,construction accessory 210 facilitates the removal of undesirable moisture otherwise captured betweenmoisture barrier 64 andcoating 68 to prolong the life ofstructure 12. At the same time,forward flange 286 further impedes wind-blown moisture and flying insects from enteringspace 74. Becauseopenings 292 extend generally perpendicular toperforations 34,openings 292 andperforations 34 enable moisture to escape fromspace 74 while reducing, if not completely eliminating, the possibility of wind-blownmoisture entering space 74. Although less desirable,openings 292 may alternatively extend through portions oflower flange 180 in lieu of or in addition to extending throughforward flange 286 to communicate withcavity 188 depending upon the configuration ofconstruction accessory 210 as well as the configuration ofstructure 12 andcasing 190.

As further shown by FIG. 7,forward flange 286 preferably has a vertical height greater than the vertical height or thickness ofspacer 182 such thatsurface 300 oflower flange 180, which extends adjacent tocavity 188 belowperforations 34, downwardly slopes away from backflange 14 andbottom flange 16 towardsforward flange 286. In the embodiment illustrated,spacer 182 has a height or thickness extending betweenlower flange 180 andbottom flange 16 of about 0.050 inches whileforward flange 286 has a vertical height of about 0.075 inches. In the embodiment illustrated,forward flange 180 is manufactured such thatsurface 300 has a natural gradient. Alternatively,lower flange 180 may be formed from a deformable or flexible material such that the greater height offorward flange 286 as compared to the vertical height ofspacer 182 causes surface 300 to deform or deflect sufficiently to causesurface 300 to have a downward slope. As shown by FIG. 7, the downwardly slopingsurface 300 further facilities the flow of moisture throughopenings 292 and away fromstructure 12.

FIG. 6 best illustrates the preferred assembly of construction assembly of 210. As best shown by FIG. 6,construction accessory 210 is preferably constructed from a firstpanel support component 296 and a second add-oncomponent 298.Component 296 includes backflange 14,bottom flange 16,side flange 18,support flange 20 andfront flange 22.Component 298 includeslower flange 180,spacer 182,drip leg 184 andforward flange 286.Lower flange 180 ofcomponent 298 is configured for being coupled tocomponent 296 so as to extend belowbottom flange 16 and so as to providesurface 300 spaced frombottom flange 16 belowperforations 34. In the embodiment illustrated, spacer 182 coupleslower flange 180 tobottom flange 16 ofcomponent 296.

As shown by FIG. 5,

components

296 and 298 are preferably coupled together by welding. In particular,spacer 182 ofcomponent 298 is positioned adjacent to the lower surface ofbottom flange 16. Sufficiently heated pins are positioned adjacent a top surface ofbottom flange 16 and are further downwardly actuated to piercebottom flange 16 and partially extend intospacer 182. At the same time, the heated pins melt and fuse the materials ofbottom flange 16 andspacer 182 together to securely couplecomponent 296 tocomponent 298. As can be appreciated, other fasteners or fastening methods using glue, adhesives, rivets, thermoplastics, thermosets, epoxies, mechanical interlocks and mechanical fasteners may be used to secure

components

296 and 298 together. Of course, these alternative fasteners or fastening methods will vary depending upon the type of materials from which

components

296 and 298 are formed as well as the particular configuration of

components

296 and 298.

Components

296 and 298 are preferably manufactured from extruded polyvinylchloride. Other manufacturing techniquest and materials may also be used.Perforations 34,perforations 46 andopenings 292 are preferably formed using punching processes. As can be appreciated, the shape and size ofperforations 34,perforations 46 andopenings 292 may vary. Moreover, the manufacturing techniques used to formperforations 34,perforations 46 andopenings 292 may also vary. As a result of this particular construction,component 298 may be easily and inexpensively manufactured. In addition,component 298 may be easily attached and added to existing panel support structures which have been modified to includeperforations 34. Althoughcomponent 298 is illustrated as includingspacer 182 andforward flange 286,spacer 182 andforward flange 286 may alternatively be formed as part ofcomponent 296 such thatspacer 182 andforward flange 286 extend from a lower surface ofbottom flange 16.

FIG. 8 is a sectional view illustratingconstruction accessory 310, a fourth embodiment ofconstruction accessory 10.Construction accessory 310 is identical toconstruction accessory 210 except thatconstruction accessory 310 additionally includesside flange 312 obliquely extending fromlower flange 180 belowopenings 292.Side flange 312 supportsdrip leg 184 below and adjacent tocasing 190.Side flange 312 is preferably integrally extruded as part ofcomponent 298. Alternatively,side flange 312 may be mounted or coupled tolower flange 180 by various fasteners or fastening methods.Side flange 312 covers and protectscasing 190. As indicated by

arrows

393, 394, and 395, moisture withinspacer 74 is effectively discharged away fromcasing 190.

Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention. The present invention described with reference to the preferred embodiments and set forth in the following claims is manifestly intended to be as broad as possible. For example, unless specifically otherwise noted, the claims reciting a single particular element also encompass a plurality of such particular elements.

Claims

What is claimed is:

1. A panel support construction accessory comprising:

a front flange;

a back flange; and

a bottom flange extending between the front flange and the back flange, the bottom flange including an array of perforations extending through the bottom flange, each perforation having a maximum diameter of about one-eighth of an inch.

2. The accessory of claim 1, wherein the array of perforations extend adjacent the back flange.

3. The accessory of claim 1, wherein the array of perforations extend opposite the back flange.

4. The accessory of claim 1, wherein the back flange extends from the bottom flange on a first side of the bottom flange, the back flange being configured to mount the accessory to at least one structural support member and wherein the accessory further includes a lower flange coupled to the bottom flange and spaced from the bottom flange on a second opposite side of the bottom flange to create a cavity below the array of perforations.

5. The accessory of claim 4, including a filter material supported adjacent the array of perforations between the bottom flange and the lower flange, wherein the filter material transmits moisture.

6. The accessory of claim 5, wherein the filter material comprises an open cellular foam.

7. The accessory of claim 4, including:

a forward flange extending non-parallel from a first one of the lower flange and the bottom flange towards a second one of the lower flange and the bottom flange adjacent the cavity; and

at least one opening in communication with the cavity extending through at least one of the forward flange and the lower flange.

8. The accessory of claim 7, wherein said at least one opening extends through the forward flange.

9. The accessory of claim 4, wherein the lower flange includes a surface adjacent the cavity that downwardly slopes away from the back flange and the bottom flange.

10. The accessory of claim 4, including a spacer coupled between the bottom flange and the lower flange.

11. The accessory of claim 10, including a forward flange extending between the lower flange and the bottom flange adjacent the cavity, wherein the spacer has a first height between the lower flange and the bottom flange and wherein the forward flange has a second greater height between the lower flange and the bottom flange.

12. The accessory of claim 10, wherein the spacer is welded between the bottom flange and the lower flange.

13. The accessory of claim 1, including a filter material supported adjacent the array of perforations, wherein the filter material transmits moisture.

14. The accessory of claim 13, wherein the filter material comprises an open cellular material.

15. The accessory of claim 1, wherein the front flange includes a plurality of perforations.

16. The accessory of claim 15, wherein the front flange includes an inner surface facing the back flange and adapted to face a construction panel, and a depression in the inner surface communicating with at least one of the plurality of perforations.

17. The accessory of claim 1 including a leg coupled to the bottom flange and extending beyond the bottom flange.

18. The accessory of claim 1, including:

a side flange extending non-parallel from the bottom flange; and

a support flange extending non-parallel from the side flange, wherein the side flange and the support flange form a channel.

19. The accessory of claim 18, wherein the support flange forms a ridge sized to elevate a construction panel above the bottom flange.

20. The accessory of claim 1, including a ridge spaced above the bottom flange, the ridge sized to elevate a construction panel above the bottom flange.

21. The accessory of claim 4, including a leg coupled to the lower flange and extending beyond the bottom flange.

22. The accessory of claim 4, including:

a side flange extending non-parallel from the lower flange away from the bottom flange; and

a leg obliquely extending from the side flange.

23. A panel support construction accessory comprising:

a bottom flange having a first side, a second opposite side and a plurality of perforations extending through the bottom flange from the first side to the second side;

a back flange extending from the bottom flange on the first side of the bottom flange;

a front flange extending on the first side of the bottom flange opposite the back flange; and

a lower flange facing the bottom flange and spaced from the bottom flange to form a cavity below the plurality of perforations adjacent the second side of the bottom flange.

24. The accessory of claim 23, wherein the plurality of perforations extend in a plurality of rows along the bottom flange.

25. The accessory of claim 23, wherein the bottom flange has a first edge adjacent to the back flange, a second opposite edge and a midpoint therebetween, wherein the bottom flange is imperforate from the first edge to the midpoint, and wherein the perforations extend adjacent the second edge.

26. The accessory of claim 23, including a spacer coupled between the bottom flange and the lower flange.

27. The accessory of claim 26, wherein the spacer is welded to the bottom flange and the lower flange.

28. The accessory of claim 23, including a filter material adjacent the plurality of perforations, the filter material transmitting moisture.

29. The accessory of claim 28, wherein the filter material comprises an open cellular foam.

30. The accessory of claim 23, including a forward flange extending between the lower flange and the bottom flange adjacent the cavity.

31. The accessory of claim 30, including at least one opening communicating with the cavity and extending through at least one of the lower flange and the forward flange.

32. The accessory of claim 31, wherein the opening extends through the forward flange.

33. The accessory of claim 30, wherein the lower flange has a surface adjacent the cavity and wherein the surface downwardly slopes away from the bottom flange towards the forward flange.

34. The accessory of claim 23, wherein the lower flange has a surface adjacent the cavity and wherein the surface downwardly slopes away from the back flange and the bottom flange.

35. The accessory of claim 23, including a ridge spaced above the bottom flange, the ridge sized to elevate a construction panel above the bottom flange.

36. The accessory of claim 23, wherein each of the plurality of perforations has a maximum diameter of about one-eighth of an inch.

37. The accessory of claim 23, including a leg coupled to the lower flange and extending beyond the bottom flange.

38. The accessory of claim 37 wherein the leg extends from the lower flange beyond the bottom flange.

39. The accessory of claim 23, including:

a side flange extending non-parallel from the bottom flange; and

40. The accessory of claim 39, wherein the support flange forms a ridge sized to elevate a construction panel above the bottom flange.

41. The accessory of claim 23, wherein the front flange includes:

a plurality of perforations extending through the front flange; and

at least one depression in a surface of the front flange communicating with at least one of the perforations.

42. A construction accessory component for use with a panel support having, a bottom flange having a first side and a second side, at least one perforation extending through the bottom flange from the first side to the second side and a back flange extending from the first side of the bottom flange, the component comprising:

a lower flange, wherein the lower flange is configured to be mounted to the bottom flange on the second side of the bottom flange such that the lower flange includes a surface spaced from the bottom flange below said at least one perforation.

43. The accessory component of claim 42, including a spacer extending from the lower flange and configured to mount the lower flange to the bottom flange.

44. The accessory component of claim 42, wherein the lower flange is configured such that the surface slopes downwardly and away from the back flange and the bottom flange when mounted to the panel support.

45. The accessory component of claim 42, including a forward flange extending non-parallel from the lower flange adjacent the surface.

46. The accessory component of claim 45, wherein at least one of the lower flange and the forward flange includes an opening extending therethrough adjacent the surface.

47. The accessory component of claim 46, wherein the opening extends through the forward flange.

48. The accessory component of claim 42, including a leg coupled to the lower flange and adapted to extend beyond the bottom flange when the lower flange is mounted to the panel support.

49. A construction accessory component for use with a panel support having a back flange, a bottom flange, and at least one perforation extending through the bottom flange, the component comprising:

a lower flange;

a spacer extending from the lower flange and configured to mount the lower flange to the bottom flange; and

a forward flange extending from the lower flange and spaced from the spacer to form a cavity therebetween, wherein the cavity is configured to extend below said at least one perforation when the component is mounted to the panel support and wherein the forward flange includes at least one perforation extending therethrough.

50. The accessory of claim 1 wherein the front flange is integrally formed with the bottom flange.

51. The accessory of claim 1 wherein the array of perforations extend along the bottom flange in a repeating pattern.

52. The accessory of claim 1 including at least one surface sloping downwardly from the back flange toward the front flange.

53. The accessory of claim 23 wherein the back flange is configured to mount the panel support construction accessory to at least one structural support member.

54. The accessory of claim 23 including at least one surface downwardly sloped from the back flange towards the front flange.

55. The accessory of claim 23 wherein the front flange is non-removably coupled to the bottom flange.

56. A panel support construction accessory comprising:

a bottom flange having a first side, a second opposite side and a plurality of perforations extending through the bottom flange from the first side to the second side, each perforation having a maximum diameter of about 1/8 of and inch;

a back flange extending from the bottom flange on the first side of the bottom flange, the back flange being configured to mount the accessory to at least one structural support member; and

a lower flange coupled to the bottom flange and spaced from the bottom flange on the second side of the bottom flange to create a cavity below the plurality of perforations.

57. The accessory of claim 50 wherein the plurality of perforations comprise an array of perforations.

58. A panel support construction accessory comprising:

a back flange;

a bottom flange extending from the back flange, the bottom flange including an array of perforations extending through the bottom flange, each perforation having a maximum diameter of about 1/8 of an inch;

a side flange extending non-parallel from the bottom flange; and

59. A panel support construction accessory comprising:

a back flange;

a bottom flange extending from the back flange, the bottom flange including an array of perforations extending through the bottom flange, each perforation having a maximum diameter of about 1/8 of an inch; and

a ridge spaced above the bottom flange, the ridge sized to elevate a construction panel above the bottom flange.

60. A construction system comprising:

at least one structural support member;

a panel support construction accessory including:

a front flange;

a back flange mounted to the at least one structural support member; and

a bottom flange extending between the front flange and the back flange, the bottom flange including an array of perforations extending through the bottom flange, each perforation having a maximum diameter of about one-eighth of an inch; and

a construction panel positioned between the back flange and the front flange above the bottom flange.

61. The system of claim 60 including a coating extending adjacent to the front flange and the construction panel.

62. The system of claim 60 wherein the back flange is directly mounted adjacent to the at least one structural support member.

63. The system of claim 60 wherein the construction accessory further includes a side flange extending non-parallel from the bottom flange and a support flange extending non-parallel from the side flange, wherein the side flange and the support flange form a channel.

64. The system of claim 63 wherein the front flange includes a plurality of perforations through which the coating extends into contact with the panel.

65. The system of claim 60 wherein the front flange includes a plurality of perforations through which the coating extends into contact with the panel.

66. The system of claim 60 wherein the bottom flange perpendicularly extends from the back flange.